use Crypt::Blowfish;

#The key size can range from 32 bits (4 characters) to 448 bits (56 characters).

system("clear"); #*nix
system("cls");   #win

print "Blowfish in perl. By jack (jack [at] crepinc.com)\n\n";
print "Enter key (4 to 56 characters): ";
my $key_t = <STDIN>;
chomp $key_t;
my $key = pack("H16", $key_t);

print "Encrypt or decrypt? ('e' or 'd'): ";
my $func = <STDIN>;
chomp $func;

if ($func eq "e") {
	print "Enter file to encrypt: ";
	my $file = <STDIN>;
	chomp $file;
	open(fileIN, $file) or die("Can't open $file: $!"); 
	@inFile = <fileIN>;
	close(fileIN);

	my $plaintex = "";
	foreach $line (@inFile) {
		chomp($line);
		$plaintex = $plaintex.$line."\n";
	}

	open(fileOUT, ">$file.enc") or die("Can't open $file.enc for writing: $!");

	my $cipher = new Crypt::Blowfish $key;
	#chomp $plaintex;
	my $len = length $plaintex;

	while ($len > 8) {
		$len -=8;
	}
	
	my $x = 8-$len;
	for ($x=0;$x<8-$len;$x++) {
		$plaintex = $plaintex." ";
	}
	
	my $len = length $plaintex;

	if ($len == 8) {
		my $ciphertext = $cipher->encrypt($plaintex);
		my $ciphertext = unpack("H16", $ciphertext);
		print fileOUT "$ciphertext";
	}

	if ($len < 8) {
		$plaintex = $plaintex."        "; 
		$plaintex = substr ($plaintex,0,8);
		my $ciphertext = $cipher->encrypt($plaintex);
		my $ciphertext = unpack("H16", $ciphertext);
		print fileOUT "$ciphertext";
	}

	if ($len > 8) {
		my $itmp = 0;
		for ($itmp=0; $itmp<$len; $itmp +=8) {
			$tmp = substr ($plaintex,$itmp,8);
			my $ciphertext = $cipher->encrypt($tmp);
			my $ciphertext = unpack("H16", $ciphertext);
			print fileOUT "$ciphertext";
		}
	}
	close(fileOUT);
	print "Done.\n";
}

if ($func eq "d") {
	print "Enter file to decrypt: ";
	my $file = <STDIN>;
	chomp $file;
	open(fileIN, $file) or die("Can't open $file: $!"); 
	@inFile = <fileIN>;
	close(fileIN);

	my $ciphertext = "";
	foreach $line (@inFile) {
		$ciphertext = "$ciphertext"."$line"."\n";
	}

	my $filelen = length $file;
	my $ext = substr($file,$filelen-4,4);
	if ($ext eq ".enc") {
		$file = substr($file,0,$filelen-4);
	}	

	open(fileOUT, ">$file") or die("Can't open $file for writing: $!");	

	
	$ciphertext = substr($ciphertext,0,$len-1);
	my $len = length $ciphertext;
	print "len $len\n";

	if ($len > 8) {
		my $itmp = 0;
		for ($itmp=0; $itmp<$len; $itmp +=16) {
			$tmp = substr ($ciphertext,$itmp,8);
			
			$tmp = pack("H16", $tmp);
			my $cipher = new Crypt::Blowfish $key;
			my $plaintext = $cipher->decrypt($tmp);
			print fileOUT "$plaintext";
		}
	}

	if ($len < 9) {
		my $cipher = new Crypt::Blowfish $key;
		$ciphertextpack = pack("H16", $ciphertext);
		my $plaintext = $cipher->decrypt($ciphertextpack);
		print fileOUT "$plaintext";
	}
	print "Done.\n";
}